I really liked the German original, so I watched this expecting it to be a different movie but in the same vein and of course with Mussolini. But I quickly realized that it's not a movie in the same vein, but essentially the exact same movie with the exact same plot. So if you have already seen "Er ist wieder da / Look Who's Back" there is really no point in watching this move, as you already know the entire plot.

Yet Hitler and Mussolini are not exactly interchangeable, but in this movie they might as well be as it makes very little to no changes to the original script. But since the original script wasn't written with Mussolini in mind, simply switching Hitler with Mussolini doesn't always work and almost always feels forced.

That said, it's not a bad movie. It just doesn't add anything new to the original aside from switching the main character to Mussolini. But if you haven't watched the original yet and would rather want to see an Italian movie than a German one, go for it. But otherwise stick with the German original (it really is the same movie anyway).